is PiFace Control and Display 2 compatible with Pi3?

  Have you tried editing /usr/lib/python3/dist-packages/pifacecommon/spi.py


Check the frequency if its 125000000 change it to the one below. look like after kernel 4.9.43 it happens and changes it to 125000000 as default which it cant support.  here is some reading on it https://github.com/raspberrypi/linux/issues/2165

# create the spi transfer struct
  transfer = spi_ioc_transfer(
  tx_buf=ctypes.addressof(wbuffer),
  rx_buf=ctypes.addressof(rbuffer),
  len=ctypes.sizeof(wbuffer),
  speed_hz=ctypes.c_uint32(100000)
  )

  Have you tried editing /usr/lib/python3/dist-packages/pifacecommon/spi.py


Check the frequency if its 125000000 change it to the one below. look like after kernel 4.9.43 it happens and changes it to 125000000 as default which it cant support.  here is some reading on it https://github.com/raspberrypi/linux/issues/2165

# create the spi transfer struct
  transfer = spi_ioc_transfer(
  tx_buf=ctypes.addressof(wbuffer),
  rx_buf=ctypes.addressof(rbuffer),
  len=ctypes.sizeof(wbuffer),
  speed_hz=ctypes.c_uint32(100000)
  )

Thanks! That got me on the right direction to fix this problem.

Since I have installed the support modules locally I needed to modify

/usr/local/lib/python3.5/dist-packages/pifacecommon/spi.py

(and the corresponding python2 libraries)

to override the default frequency by changing the transfer setting from

      # create the spi transfer struct
        transfer = spi_ioc_transfer(
            tx_buf=ctypes.addressof(wbuffer),
            rx_buf=ctypes.addressof(rbuffer),
            len=ctypes.sizeof(wbuffer) 
        )

to

      # create the spi transfer struct
        transfer = spi_ioc_transfer(
            tx_buf=ctypes.addressof(wbuffer),
            rx_buf=ctypes.addressof(rbuffer),
            len=ctypes.sizeof(wbuffer),
            speed_hz=ctypes.c_uint32(100000) 
        )

Then all my previous packages works perfect with the new kernel 4.9.59-v7+

Strange that this isn't an FAQ.

Thanks again!

just a newbie here,

~almost there...editied and saved the spi.py as suggested, however,

I'm getting a syntax error on the edit addin for : speed_hz=ctypes.c_uint32(100000)

after I run my leds test:

Traceback (most recent call last):

  File "leds.py", line 1, in <module>

    import pifacedigitalio

  File "/usr/local/lib/python3.5/dist-packages/pifacedigitalio/__init__.py", line 18, in <module>

    from pifacecommon.interrupts import (

  File "/usr/local/lib/python3.5/dist-packages/pifacecommon/interrupts.py", line 7, in <module>

    import pifacecommon.mcp23s17

  File "/usr/local/lib/python3.5/dist-packages/pifacecommon/mcp23s17.py", line 7, in <module>

    from .spi import SPIDevice

  File "/usr/local/lib/python3.5/dist-packages/pifacecommon/spi.py", line 69

    speed_hz=ctypes.c_uint32(100000)